pylint-errors
W0631 (undefined-loop-variable)
Problematic code:
data = {'x': 1, 'y': 2, 'z': 3}
for k, v in data.items():
x = f'key: {k} => value: {v}'
break
print(x)
Correct code:
data = {'x': 1, 'y': 2, 'z': 3}
x = None
for k, v in data.items():
x = f'key: {k} => value: {v}'
break
print(x)
Rationale:
Used when a loop variable (i.e. defined by a for loop or a list comprehension or a generator expression) is used outside the loop.